Laravel 8 with laravelcollective/html 6.2, Action Controller#function not defined - laravel

Question

I am new to Laravel and Stackoverflow
When Laravel7 is released, I started to learn Laravel.
The new version 8.0 was introduced not long ago and I started to try it.
I cannot define that the problem is caused by a newer version of Laravelor any misconfiguration.
When I try the following (edit.blade.php)
{!! Form::open(['action' => ['ProductController#update', $product->id], 'method' => 'POST']) !!}
or
{!! Form::open(['action' => [[ProductController::class, 'update'], $product->id], 'method' => 'POST']) !!}
an error occurred
Action ProductController#update not defined
then I tried to replace the controller name with a path like
{!! Form::open(['action' => ['App\Http\Controllers\ProductController#update', $product->id], 'method' => 'POST']) !!}
or
{!! Form::open(['action' => [[App\Http\Controllers\ProductController::class, 'update'], $product->id], 'method' => 'POST']) !!}
It works!
so I think this is about namespace
but I have a namespace heading
namespace App\Http\Controllers; in my App\Http\ProductController.php
although I can solve the problem by typing the full path of the controller in the collective form,
I am worried that my code has configuration error or syntax errors, etc.

Answer 1

This is a change to Laravel 8. There is no namespace prefix applied to your routes by default and there is no namespace prefix used when generating URLs to "actions".
To have the namespace prefixed to the Controller you are trying to reference when generating URLs to actions you would need to define the $namespace property on your App\Providers\RouteServiceProvider:
protected $namespace = 'App\Http\Controllers';
Now you can reference your action with that namespace prefix:
Form::open(['action' => ['ProductController#update', $product->id], 'method' => 'POST'])

Answer 2

In Laravel 8: use this code I think your problem will be solved
web.php
Route::middleware(['auth:sanctum', 'verified'])->group(function () {
Route::get('create', 'Product\ProductController#Create')->name('product.create')->middleware('can:Add Product');
Route::post('create', 'Product\ProductController#Store')->name('product.store')->middleware('can:Add Product');
});
resources/views/product:
<form method="post" action="{{ route('product.store') }}" enctype="multipart/form-data">
#csrf
{{-- START - PRODUCT INFORMATION --}}
{{-- END- PRODUCT INFORMATION --}}
</form>
app/Http/Controllers/Products:
<?php
namespace App\Http\Controllers\Products;
use App\Http\Requests\Product\ProductRequest;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
class ProductController extends Controller {
//---Constructor Function
public function __construct() {
$this->middleware('auth:sanctum');
}//---End of Function Constructor
//---Create Product
public function create() {
return view('product.product_add');
}//---End of Function create
//---Store Product in Database
public function store(ProductRequest $request) {
//---Add Product Details in DB
}
?>

Answer 3

Laravel 8 : Collective form - This is using to create a Laravel view page
{!! Form::open(['route' => '', 'id'=>'form','class' => 'needs-validation',]) !!}
<div class="form-group row">
{!! Form::label('employee_id', 'Employee ID:', ['class'=>'col-md-1 col-form-label custom_required']) !!}
<!-- Employee ID -->
<div class="form-group row">
{!! Form::label('employee_name', 'Employee Name:', ['class'=>'col-md-1 col-form-label custom_required']) !!}
<div class="col-lg-8">
{!! Form::text('employee_name', #$employee_id, ['class' => 'form-control', 'required', 'placeholder' => 'Employee Name', 'pattern'=> '^[a-z A-Z0-9_.-]*$']) !!}
</div>
<!-- Employee number -->
<div class="form-group row">
{!! Form::label('phone_number', 'Number:', ['class'=>'col-md-1 col-form-label custom_required']) !!}
<div class="col-lg-8">
{!! Form::text('phone_number', #$phone_number, ['class' => 'form-control', 'required','placeholder' => 'number']) !!}
</div>
{!! Form::close() !!}